The day temperature in the suburbs on Wednesday touched 36.4 degrees Celsius, three degrees above normal, as strong sunlight and the absence of strong winds made the day hot and humid.
The maximum temperature in south Mumbai, too, shot up by two degrees to 34.9 degrees Celsius.
Experts said the rise in temperatures is a seasonal phenomenon and the withdrawal of monsoon is likely within a week in Mumbai, central and southern parts of Maharashtra.
“There is no significant reason for the increase. The rise in temperature is mostly because of clear skies and easterly winds that carry hot air,” said VK Rajeev, director, western region, India Meteorological Department (IMD), adding, “Similar conditions are likely to prevail for the next two days.”
Humidity levels increased from 71% during the day at Colaba to 83% in the evening. However, Sanatacruz recorded 72% and 67% in the morning and evening respectively.
Meanwhile, the suburbs recorded a below normal night temperature at 23.4 degrees Celsius, while the temperature at south Mumbai was 26.8 degrees Celsius, 1.8 degrees above normal.
Weathermen have predicted partly cloudy skies with maximum and minimum temperatures at 36 degrees Celsius and 24 degrees Celsius for Thursday.
The air quality index (AQI), a pollution-measuring indicator measured by the United States Consulate General Mumbai, Bandra, was 157 at 6pm.
It falls in the ‘unhealthy’ category.
The level of particulate matter (PM 2.5), too, was 67.6 microgram a cubic metre (ug/m3), higher than the permissible limit of 67.6 microgram a cubic metre.